Requested Delivery Date Cannot Be Selected Via Date Icon

We have a business process is that create and process the RFQ from approved Requisition through document builder. While processing RFQ, we are facing one issue at line section.

Issue: When trying to change and select the other Requested delivery date then sometimes system is allowing to select the other date and sometimes system is not allowing to select the date date.

If you move the cursor slightly away from the middle of the bubble, it turns into a pointer, then only able to select it, this is how the date-picker component is behaving. There is also a Doc ID.